Add Time Penalty After Leave Clan
This game has a issue with vagrant players who both join and leave clans incessantly. I think it'd be helpful if there was some sort of time penalty applied whenever a player exits a clan. For example, if I left a clan right now, then I'd have to wait 1-12 hrs (any amount of time would do) before I could join another clan. The time penalty would both encourage stability within clans, and cut down on spying during clan wars.
P.s. This is already a feature used in other games for above reasons (one game in particular, "Summoners Wars", has a 12hr timeout).